We recorded
the child’s interaction a logging file to study the progress through
subsequent sessions. The file log captures each event –user event
or system event. With an ad-hoc analysis tool we study variables such
as the decreasing of time localization through sessions, error rate
and pattern of interaction. As we have described, the virtual environment
includes a main corridor with two divergent second corridors. To simplify
the graphs we show only some interactions that happened in the main
corridor. The child can perform and receive events from three different
surrounding voxels labeled as left, middle, and right. In the following
figures, each icon represents an event. The small box located in the
upper left side of each icon is different grayed to indicate the class
of the event.

Fig.
Above, the child´s surrounding voxels drawed on the picture. Below,
trace of the first interaction with the audio virtual environment.

.

A. There
are almost twenty seconds without user activity, may be the child
is confused.

B. A
box of bullets is encountered. The child tries pick up the bullet
box in the wrong voxel

C. The
same pattern of B is displayed. The child cannot localize accurately
the representative sound.

D. With
a few steps the child arrives to the first door.

E. The
child tries to open the door after 5 seconds. The first try was
made in the wrong voxel

Fig.
After some training the child is able to pick up the objects almost
immediately without errors. Notice that to reach to the end of the
corridor the child took only 25 seconds instead of more than 60 seconds
in the first try –displayed in fig.7-.

Fig.
Trace of the pattern of interaction to reach the end of the main corridor.
At the end, the child encounters the final goal -the center of the
flying source-.

A. The
child localizes the box of bullets and picks it up without errors

B. The
child fails to detect the position of the door. After some tries
he can open the door

C. A
monster appears and the child fails the shooting pointing a wrong
voxel. Then he fixes his error and destroys the monster after three
shots

D. The
child opens the last door of the main corridor

E. The
mutant appears and moves from voxel to voxel after some seconds.
Then the child destroys it

F. The
child arrives to the end of the main corridor and destroys the center
of the flying source